PXF4336V11 INFINEON [Infineon Technologies AG], PXF4336V11 Datasheet - Page 146

• Manufacturer Part Number: PXF4336V11
• Description: ABM Premium ATM Buf fer Manager
• Manufacturer: INFINEON [Infineon Technologies AG]

4.2.2.7
The total WFQ scheduler rate is calculated as follows:
with CCR
being the effective cell rate of the high priority RR scheduler in the SB.
GCR
T
The guaranteed cell rate for connection i is calculated according to:
with T
Therefore, T
The minimum guaranteed cell rate at a given GCR
Assuming a fixed given GCR
T
The integer function in equation above selects the next smaller value of the integer T
that is to say, the weight factor is higher than required and, thus, the queue is served
slightly faster in order to guarantee the rate.
Two special cases must be considered:
T
T
T
DQPT2T1” on Page
Data Sheet
WFQ
WFQ
WFQ
WFQ
WFQ
.
WFQ
= 0 is used to assign the queue to the high priority round robin scheduler.
= 16383 is used to assign the queue to the low priority round robin scheduler.
can be calculated as:
is referred to as parameter WFQFactor in the register description
WFQ
is distributed to the queues in proportion to the queue’s relative weight factor 1/
SB
constrained internally to:
GCR
Guaranteed Cell Rates and WFQ Weight Factors
GCR
T
T
GCR
WFQmax
being the configured SB rate as defined in
WFQ
WFQ
WFQ
i
min
=
=
= 16320.
2
------------------------------------------------------------------------------------------------- -
T
14
GCR
----------------------------------------------------- -
303.
=
=
WFQ i
–
GCR
-------------------------
T
CCR
2
WF Qmax
6
min
GCR
min
WFQ
SB
, then for any given GCR
T
k
–
WFQmax
ECR
GCR
Active Queues
å
RT SB
WFQ
146
1 T
WFQ
WFQ k
is therefore:
Section 4.2.2.2
GCR
Operational Description
min
the corresponding
PXF 4336 V1.1
and ECR
“UQPT2T1/
2001-12-17
ABM-P
RT(SB)
WFQ
(25)
(26)
(27)
(28)
(29)
,